PLease help me LOTS of points

Answer:
15) a) 8
b) y + 2
c) y - 1
16) True
17) 2n - 1, where n is an integer
18) a) 3p + 4q
b) 500 - 3p - 4q
Answer:
16. 2n = 10
17. 6x + 42 - 6 = 546
18. A. [tex]\frac{-3}{4} p + 125[/tex]
B. $2.25
Step-by-step explanation: